Method of making thread-protectors.



P. J. SHRUM.

METHOD 0F MAKING THREAD PROTBOTORS.,

AFPLIOATION FILED PEB.2T4,1914.

iur euros.

Pn'rnn. Tonino oomrnNY, or PITTSBURGH,

srtvnurn,

J. sHmIM, or mennen, PENNSYLVANIA; aantonen 'ro coLoNn MANUFAC- rsnusriivaiim, A conronn'rion or PENN- METHOD F MAKING THREDPROTEQTORS.

misere,

Specification of Letters Patent.l .Ptnted Nov, 2.3 1914,.`

Application flied February 211914. Serial No. 820,393.

Y J. SHRUM, Aa residing at invention coneists of in` improved method of making thread protectors or similar articles from longitudinal cylindrical sections of metal tubing,

and has Ior its object particularly to form devices of this kind for the purpose of making threadprotectors, of the type disclosed 1nl the prior at- No. 102396@ issue to Rae and Joseph W.

. ent of Apr. 23, 1912, myself, William C. Ripper.

The .protector consists of a cylindrical shell having a contracted end portion for theth-reads, a bulging clearanceportion near the other end, and an inwardly turned lim iting flange. i

The device is formed from tubing, preferably seamless tubing, by an u setting process, whereby to turn t.. one en inwardly, reducing its internal diameter to provide the limiting flange, and et the saine time' forcing;` the other end longitudinally ol the blank, and also drawing it inwardly l'or the threaded portion, the operation being; performed in one continuous step, by means of suitable dies.

ln the drawings illustrating the operation or metliodf-Figme l shows the upper and lower die in open position, with the tubular blank inserted, ready for the operation. Fig'. 2 4is n sii'nilar view, showing the dies closed together ut the end of the operation. Fig'. 3 is a sectional View ol' the dies, like Fig. l, showing the operation of Stripping the finished protector 'from the upper die.. Fig. si is a plan view ol" the lower die.

Fig. a longitudinal sectional view of the lonmi` gitudinally pressed blank, as formed between the dies. device. Fig. 7 is a. vertical sectional view of tbe finished protector, provided with the attaching threads, and in operative relation ed to the end of the pipe, shown in dotted lines. In the drawings, the blank a consists of a section of tubing of the required len th, diameter, and thickness to produce t ie finislied article for attachment upon the threadd State oli the blanlr4 an annular shoulder 12.

Fig. t is a plan view of the' A13 having at edlendof'lthe pipe to be protected and of the particular size for which tbe protector is designed. The blank should be of such a length as to provider at its upper portion a straight section or neck b which is to be slightly constricted or reduced in diameter, and a lower bulging or rounddd section c, the terminal edge oi which is to be turned inwardly to form the limiting flange cl, as clearly shown in Figs. 5 and 6,

The dies for forming; the device consist of a lower, preferably stationary, die 2 and an upper vertically movable die 3-6, adapted to be' mounted 1n and actuated by the reciprocatin head A of a suitable press.

The ljower die .2 is provided with a bowl shaped cavity 4, of a diameter adapted to receive the end of the blank a, rounded in- Wardly toward the center, whereby to force the edge of the blank inwardly as it is preed downwardly by the upper .compound die -ed. At the center of the lower die il is a 4circular abutment 5, extending upwardly sulliciently far to provide a limiting central core rior the inwardly swaged edge of the blank, as indicated in Fig. 9..

The upper outer die 8 is secured to head A. and is provided with a cylindrical telescoping mandrel die (l supported by au upper liiniting flange 7 upon an annular shoulder 8, a c earance space above die 6, preferably in head A, to allow for upward movement of die 6, us in Fig. 2.

' Outer die 3 is irovided with en annular flaring wall l0 of ell foi-m, adapted to coni-` press tlie entering edge portion b of the blank inwardly toward the terminal 11 of die Said terminal-is reduced in `diameter to lprovide a mandrel bearing for the contracted end b of the formed article, be ond The depth of c earance cavity 9 is substantially equal to the length of the straight neck b, which engages shoulder 12 and 'orcesdie 6 upwardly, as in Fig. 2. The space for the remainder of the protector, comprisin the rounded bul portion c, is divide between the dept the flaring bebb portion 10 and of the bowlshaped or dished rtion 4f of the die 2.'

Centrally of 'e 6 and extending upwardly through head.

or abutment 14 and it its upper end a ing mit or collar 15. or bar 1 9 being provided A is a knock-out rod its lower end a knock-out disk limitl,

inioo ggg gages against the inwardly turned flange d,

.,nreiibly detachinf,r the finished article from 'ie.,er1t1'al die, as in Fig. 3, allowing it to rop Uli, l "ving the machine ready tor the next opra n, in.

VVhen thel dies are brought together,r the opposite end portions of the blank will he drawn inwardly, the maximun'i diameter of the hlanlf. he 'uhstantially retained in the cranx'f] of ghernlging portion c. The metal in the en n etaining lip or flange d and in the threat., providing portion or neck o is 'therefore compressed or densitied, thereby increasing its strength and enduring qualities, and providing for cutting of the threads in the iiniished article. Such finished article, ae shown in Fig. 7, is provided with the interior' th reads ll, tapped co-exr tensively with the length of the inner straight portion of the neck 7), and when the protector is screwed upon the pipe, as indicated, its movement is limited by the terini nal flange "l, while at the saine time prac tically coverimgr the entire threaded portion of the tubo.

By the above described method I am enabled to dispense with the use of interior inandrels heretofore employed and to prov, mi v J7 ducev the finished article in one operation, ready 'for the threading step.

It Will he understood that the size, proportions, and other elements of the dies are to he designed for each particular, size, shape, and gage of protector, and that the operation may be performed in connection with any suitaole forming mechanism having other details of construction, within the province of the skilled mechanic.

Having described my invention, what I claim is: Y

1. The method of making thread pro tectors from tubular blanks consisting in si multaneously applying endwise and inward transverse swaging pressure at the terminal portions of the blank while maintaining the normal diameter between the same.

2. The method of forming the body portion of a thread 4protector from a blank of open-Qmled tubing consisting in simultane- PETER J. SHRUM.

WitnesseA WM. G, Brennan, i1 maar ,"lnUMPETnR.

. ously applying endwise and inward trans- 

